Move crypto files out of base, to a top level directory.

crypto/symmetric_key.h

Index: crypto/symmetric_key.h
===================================================================
--- crypto/symmetric_key.h	(revision 79901)
+++ crypto/symmetric_key.h	(working copy)
@@ -2,28 +2,27 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef BASE_CRYPTO_SYMMETRIC_KEY_H_
-#define BASE_CRYPTO_SYMMETRIC_KEY_H_
+#ifndef CRYPTO_SYMMETRIC_KEY_H_
+#define CRYPTO_SYMMETRIC_KEY_H_
 #pragma once
 
 #include <string>
 
-#include "base/base_api.h"
 #include "base/basictypes.h"
 
 #if defined(USE_NSS)
-#include "base/crypto/scoped_nss_types.h"
+#include "crypto/scoped_nss_types.h"
 #elif defined(OS_MACOSX)
 #include <Security/cssmtype.h>
 #elif defined(OS_WIN)
-#include "base/crypto/scoped_capi_types.h"
+#include "crypto/scoped_capi_types.h"
 #endif
 
-namespace base {
+namespace crypto {
 
 // Wraps a platform-specific symmetric key and allows it to be held in a
 // scoped_ptr.
-class BASE_API SymmetricKey {
+class SymmetricKey {
  public:
   // Defines the algorithm that a key will be used with. See also
   // classs Encrptor.
@@ -100,6 +99,6 @@
   DISALLOW_COPY_AND_ASSIGN(SymmetricKey);
 };
 
-}  // namespace base
+}  // namespace crypto
 
-#endif  // BASE_CRYPTO_SYMMETRIC_KEY_H_
+#endif  // CRYPTO_SYMMETRIC_KEY_H_